EP 0252522 A2 19880113 - Sound reproducing apparatus for use in vehicle.
Title (en)
Sound reproducing apparatus for use in vehicle.
Title (de)
Schallwiedergabe-Apparat zur Anwendung in einem Fahrzeug.
Title (fr)
Appareil de reproduction sonore pour utilisation dans un véhicule.
Publication
Application
Priority
- JP 16410886 A 19860711
- JP 26603186 A 19861107
- JP 26603286 A 19861107
- JP 27252086 A 19861114
- JP 28926586 A 19861204
Abstract (en)
A sound reproducing apparatus for use in a vehicle having a speaker system constituted by at least one acoustic duct and a speaker unit disposed at a throat of the acoustic duct, an opening formed at the other end of the acoustic duct facing the passenger compartment of a vehicle. The apparatus is arranged such that, F0 and Fs are substantially equal to each other. Where Fs is the lowest frequency in a frequency range within which the imaginary part of the acoustic impedance at the sound radiating surface of the speaker system in the direction of the space within the passenger compartment is zero and F0 is the low-range resonance frequency of the speaker system itself in the free space.
IPC 1-7
IPC 8 full level
H04R 1/28 (2006.01)
CPC (source: EP US)
H04R 1/2857 (2013.01 - EP US); H04R 1/2842 (2013.01 - EP US); H04R 1/2865 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0252522 A2 19880113; EP 0252522 A3 19890118; EP 0252522 B1 19930310; CA 1279270 C 19910122; DE 3784568 D1 19930415; DE 3784568 T2 19931007; US 4924962 A 19900515
DOCDB simple family (application)
EP 87110010 A 19870710; CA 541839 A 19870710; DE 3784568 T 19870710; US 7182987 A 19870710